1) The base is located on hospital Los Santos
2) Installation:
1. Install Map editor from this site.
2. After installing Map editor, transfer all files from the archive to the path: folder with GTA 5 \ Scripts. If there is no Scripts folder, then create it.
3. Download the map from the website. After that, transfer the Hospital base file to the folder with your GTA 5
This completes the installation
Credits:
Frannchesko